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Influence of dc Component during Inadvertent Operation of the High Voltage Generator Circuit Breaker during Mis-Synchronization

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Energy and Power Engineering 2013年第3期5卷 225-235页

作者： Kadri Kadriu ali gashi Ibrahim gashi ali Hamiti Gazmend Kabashi Faculty of Electric Engineering and Computer Sciences University of Prishtina Prishtina Kosovo KOSTT—Kosovo Transmission System and Market Operator Prishtina Kosovo

This paper analyses the synchronization problem of a generator onto power system without satisfying synchronization condition. The main focus of the paper is on the impact of the dc component of the current in the high voltage circuit breaker during its close-open operating cycle. Using real time measurements of currents/voltages and angles during the close-opening cycle of high voltage generator circuit breaker and the impact of the dc component of current in context of interrupting large magnitude of current from the circuit breaker. In addition, the paper describes a study case model and the results of simulations performed using the software EMTP-ATP of an actual incident that occurred during the inadvertent synchronization of a large 339 MW, 24 kV generator to the grid.

关键词： High Voltage Generator Circuit Breaker dc Component of Current Asynchronous Connection Delay Current Zero

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Simulation the Wind Grid Code Requirements for Wind Farms Connection in Kosovo Transmission Grid

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Energy and Power Engineering 2012年第6期4卷 482-495页

作者： ali gashi Gazmend Kabashi Skender Kabashi Skender Ahmetaj Valon Veliu Faculty of Electric Engineering and Computer Sciences University of Pristina Pristina Kosovo Faculty of Mathematical and Natural Sciences University of Pristina Pristina Kosovo

This paper presents aspects of study and simulation approach for planned wind power projects in Kosovo Power System in relation with Grid Code requirements. All generators, connected to the Kosovo Transmission System are required to comply with the Grid Code. The Grid Code was originally developed with conventional synchronous generators. Since Wind Turbine Generators don’t have the same characteristics as synchronous generators, it was considered appropriate to develop a new set of Grid Code provisions specifically for Wind Farm Power Stations in relation with specific characteristic of Kosovo Power System. With high excepted penetration of wind power, a simultaneous loss of Wind Farms generation will put in the risk the security and reliability of Power System. Therefore, the main requirements for Wind farm power stations concern the fault ride through capability, frequency operation range, and reactive power capability of wind turbines. In the case of grid faults wind turbines have to supply a definite reactive power depending on the instantaneous voltage level of connection point and they must return quickly to normal operation.

关键词： Impact on the Grid of Wind Parks Fault Ride Through PSS/E Dynamic Simulation Wind Grid Code Wind Turbine Generators

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